The main limitation of the census data is that it is only available for a single point in time in 2013. Although data from the 2018 census will eventually become available, we also need a way to track the number of women on an ongoing basis. We can do this using tax records from the IRD.
Methodology
Tax records are used to identify people who received income from a business in an industry relating to one of the trades. Information about occupation is not available in IRD records so we use only industry to identify people. We use the same core industries for the census data.
The workforce in a sector consists of those who earned income from businesses in industries relevant to each trade sector. An individual is included as an employee in a particular quarter if they received at least $1500 in wages or salary for that quarter. An employer is included in a particular tax year if they received any income from a business that year. Employer data is not available on a quarterly basis. Yearly numbers are calculated as averages of the quarters.
Access to the data used in this study was provided by Stats NZ under conditions designed to give effect to the security and confidentiality provisions of the Data and Statistics Act 2022. The results presented in this study are the work of the author, not Stats NZ or individual data suppliers.
These results are not official statistics. They have been created for research purposes from the Integrated Data Infrastructure (IDI) which is carefully managed by Stats NZ. For more information about the IDI please visit https://www.stats.govt.nz/integrated-data/.
The results are based in part on tax data supplied by Inland Revenue to Stats NZ under the Tax Administration Act 1994 for statistical purposes. Any discussion of data limitations or weaknesses is in the context of using the IDI for statistical purposes, and is not related to the data's ability to support Inland Revenue's core operational requirements.
